I have a fairly complex block which with snap set to auto if the mouse approaches the block Qcad will hang for 30 seconds to a minute.
I have enabled individual snaps and it seems to hang on "snapintersectionmiddlemanual" and "snapintersection" but not others.
Also while trying individual snap types I noticed that the buttons seem to stick down, indicating that more than one snap type is selected, unsure if this is normal behaviour. Pushing the "auto" button does not make all the other snap button pop up.
Running Windows XP